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US6455976B1 - Motor/generator with separated cores - Google Patents

Motor/generator with separated cores Download PDF

Info

Publication number
US6455976B1
US6455976B1 US09/670,617 US67061700A US6455976B1 US 6455976 B1 US6455976 B1 US 6455976B1 US 67061700 A US67061700 A US 67061700A US 6455976 B1 US6455976 B1 US 6455976B1
Authority
US
United States
Prior art keywords
cores
stator
retaining plates
motor
generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US09/670,617
Other languages
English (en)
Inventor
Masaki Nakano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Assigned to NISSAN MOTOR CO., LTD. reassignment NISSAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKANO, MASAKI
Application granted granted Critical
Publication of US6455976B1 publication Critical patent/US6455976B1/en
Adjusted expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles

Definitions

  • This invention relates to a supporting structure for separated stator cores in a motor or generator.
  • a stator of a motor or generator is provided with a plurality of cores for example disposed at equal angular intervals in a radial direction. Winding of wire is performed on each core. As a result, apart from a space required to simply store the wire, a space is required between two adjacent cores in order to perform the winding process.
  • a motor/generator is known in which the cores are separated in order to reduce this space.
  • the cores are separated in the direction of a circular periphery and cores pre-wound with wire are joined to form the stator.
  • stator using separated cores is more complex in its shape and structure than a stator using non-separated stator cores.
  • the cores are generally formed by lamination of pressed plate members, and the use of separated cores requires high pressing accuracy at the connecting section. Such a demand on accuracy may shorten the component life of the pressing mold.
  • the separated cores may be joined by welding.
  • welding can adversely affect the magnetic properties of a core.
  • this invention provides a motor/generator comprising a stator having a plurality of cores arranged on a circle, a rotor rotating on an inner side of the stator, a plurality of retaining plates, a case which prevents a displacement of the cores in the direction away from a center of the stator, and a pair of ring-shaped fixing members facing each other.
  • Each of the cores comprises a base which increases a width in a direction away from the center of the stator, and the retaining plates support the bases of the cores so as to prevent a displacement of the cores in the direction towards the center of the stator.
  • the ring-shaped fixing members respectively hold ends of the retaining plates.
  • FIG. 1 is a lateral cross-sectional view of a separated-core motor according to this invention.
  • FIG. 2 is a longitudinal cross-sectional view of the separated-core motor taken along the line II—II in FIG. 1 .
  • FIG. 3 is a lateral cross-sectional view of essential parts of the separated-core motor describing a positional relationship between an arc-shaped groove and a fixing plate according to this invention.
  • FIG. 4 is a lateral cross-sectional view of a separated-core motor according to a second embodiment of this invention.
  • FIG. 5 is a longitudinal cross-sectional view of the separated-core motor according to the second embodiment of this invention.
  • FIG. 6 is a lateral cross-sectional view of a separated-core motor according to a third embodiment of this invention.
  • FIG. 7 is a longitudinal cross-sectional view of a separated-core motor according to the third embodiment of this invention.
  • FIG. 8 is a lateral cross-sectional view of a separated-core motor according to a fourth embodiment of this invention.
  • FIG. 9 is a longitudinal cross-sectional view of the separated-core motor according to the fourth embodiment of this invention.
  • a multi-shaft motor with separated cores is a composite current driven multi-shaft motor comprising a first rotor 2 , a second rotor 3 and a stator 14 disposed in a case 1 .
  • the first rotor 2 is provided with six magnets 6 disposed at equal angular intervals about an output shaft 5 . These magnets have N-poles and S-poles alternatively arranged on the outer periphery of the first rotor 2 .
  • the second rotor 3 is provided with eight magnets 7 disposed at equal angular intervals about an output shaft 4 . These magnets have N-poles and S-poles alternatively arranged on the outer periphery of the first rotor 3 .
  • the output shaft 4 has a cylindrical shape and is supported co-axially by a bearing on an outer side of the output shaft 5 .
  • the first rotor 2 and the second rotor 3 are disposed in series in an axial direction as shown in FIG. 2 .
  • the stator is formed by three core groups A, B, C.
  • the group A is comprised by twelve cores 11 disposed on a circle at regular intervals.
  • Group A cores are disposed co-axially on an outer side of the first rotor 2 .
  • a stator coil 16 is previously wound on each core 11 .
  • a space 15 for accommodating coil wires is provided between adjacent cores 11 .
  • Group B is comprised by twelve cores 12 disposed on a circle at regular intervals in the same manner as Group A above.
  • Group B cores are disposed co-axially on an outer side of the second rotor 3 . Although a fixed space 17 is provided between the cores 12 , winding of wire is not performed on the cores 12 .
  • Group C is comprised by twelve cores 13 disposed on a circle at regular intervals in the same manner as Groups A and B above.
  • Group C cores are disposed co-axially on an outer side of the core 11 of Group A and the core 12 of Group B.
  • the core 13 is fitted into a slot on an inner periphery of a cylindrical case 1 formed by a non-magnetic body. A wall face of the non-magnetic body is interposed between two adjacent cores 13 . Winding of wire is not performed on the core 13 .
  • the cores 11 , 12 , 13 are disposed at the same angular positions about the output shaft 5 . That is to say, as shown in FIG. 1, the core 11 and the core 13 are layered in a radial direction and the cores 12 and 13 are also layered in a radial direction.
  • Each core 11 and 12 is comprised by a plate member laminated in the direction of the output shaft 5 .
  • Each of the cores 13 is comprised by a plate member laminated in the circumferential direction of the case 1 .
  • the multi-shaft motor independently drives the first rotor 1 and the second rotor 2 by application of a composite current to the stator coil 16 .
  • the principle of this type of motion is disclosed for example in U.S. Pat. No. 6, 049,152.
  • Bases 11 A and 12 A having slanted surfaces extruding in lateral directions are formed on outer peripheries of the cores 11 and 12 .
  • the cores 11 and 12 are retained in the case 1 by retaining plates 18 engaged to the bases 11 A and 12 A, and the core 13 disposed on the outer side of the cores 11 and 12 .
  • the retaining plates 18 are band-shaped members with a trapezoidal cross-section and disposed at equal angular intervals in parallel with the output shaft 5 . Each retaining plate 18 is gripped by two adjacent bases 11 A of the cores 11 and in the same manner, is gripped by two adjacent bases 12 A of the cores 12 .
  • both ends of the retaining plate 18 are engaged with the rings 21 , 22 .
  • the ring 21 is provided with a ring groove 23 and the ring 22 is provided with a ring groove 24 .
  • the ends of the retaining plate 18 engage with these ring grooves 23 and 24 .
  • a total of twelve retaining plates 18 are disposed on the same circle on which the bases 11 A and 12 A are disposed, and the slated surfaces of the retaining plates 18 corresponding to the oblique lines of the trapezoid are in contact with the slanted surfaces of the bases 11 A and 12 A.
  • the ring grooves 23 ( 24 ) are provided with an outer and inner walls facing with each other.
  • a radius R 1 of the inner wall of the ring grooves 23 and 24 is set to be slightly greater than a radius R 2 of the circle formed by the inner peripheral faces of the retaining plates 18 .
  • a reinforcing ring 25 supports the inner periphery of the retaining plates 18 in order to prevent deformation of the retaining plates 18 towards the output shaft 5 .
  • the outer periphery of the reinforcing ring 25 is set to equal the radius R 2 .
  • the reinforcing ring 25 is disposed in the space between the cores 11 and cores 12 .
  • a stator comprised from the cores 11 , 12 , 13 of the groups A, B, C, the first rotor 2 , the second rotor 3 and the output shafts 4 and 5 are disposed in the case 1 as shown in FIG. 1 .
  • the inner walls of the ring grooves 23 and 24 are press fitted into the inner periphery of the retaining plates 18 , and the end plates 1 A and 1 B are fixed to both side faces of the case 1 by bolts.
  • the rings 21 and 22 are not necessarily fixed to the end plates 1 A and 1 B.
  • a force in a radial direction acts on the retaining plates 18 as a result of the press fitting of the ring grooves 23 and 24 on the ends of the retaining plates 18 .
  • the force deforms both ends of the retaining plates outward, that is to say, in a direction away from the output shaft 5 .
  • the central section of the retaining plates 18 displays a tendency to bend inward or towards the output shaft 5 as a result of this deformation.
  • the reinforcing ring 25 prevents the retaining plates 18 from bending inwardly. Therefore the displacement of the cores 11 and 12 , which engages with the retaining plates 18 at the bases 11 A and 12 A, towards the output shaft 5 is also prevented.
  • the cores 11 and 12 abut with the cores 13 which are fitted in the case 1 , so the outward displacement of the cores 11 and 12 , i.e., the displacement in a direction away from the output shaft 5 is also prevented. In this way, the cores 11 and 12 are accurately retained in fixed positions in the case 1 .
  • the cores 11 and 12 need not to have a special shape or structure to join to the adjacent cores.
  • the reinforcing ring 25 also has the function of maintaining the intervals in the direction of the output shaft 5 of the cores 11 and 12 in addition to the function of preventing deformation of the retaining plates 18 .
  • both ends of the retaining plates 18 are supported by the ring grooves 23 and 24 formed in the rings 21 and 22 , the retaining plates 18 only abut with the inner walls of the ring grooves 23 and 24 .
  • This type of wall may also be obtained by forming the rings 21 and 22 in an “L” shape or by welding a short cylindrical member to the end plates 1 A and 1 B as rings 21 and 22 .
  • the core 12 of group B has the same structure as the core 11 of group A.
  • Stator coils 16 A and 16 B are previously wound on each core 11 and 12 .
  • the cores of each group are integrated by assembly into the case 1 .
  • the structure of the first rotor 2 and the second rotor 3 is the same as that described with reference to the first embodiment.
  • the cores 11 and 12 are magnetically connected through a core 13 of group C. As a result, the magnetic field formed by the stator coil 16 A with respect to the first rotor 2 is oriented in an opposite direction to the magnetic field formed by the stator coil 16 B with respect to the second rotor 3 .
  • the retaining plates 18 are engaged respectively between the base 11 A adjacent to the core 11 and the base 12 A adjacent to the core 12 . Both ends of the retaining plates 18 are engaged with the rings 21 and 22 as in the same manner as the first embodiment.
  • a reinforcing ring 25 is disposed between the cores 11 and 12 to support the inner periphery of the retaining plates 18 .
  • FIG. 6 and FIG. 7 A third embodiment of this invention will now be described referring to FIG. 6 and FIG. 7 .
  • a motor with separated cores disposes a double-unit motor independently in the case 1 .
  • the first rotor 2 and the second rotor 3 are supported by the output shaft 4 and the output shaft 5 in the case 1 in the same manner as the first and second embodiments.
  • the motor according to this embodiment does not comprise the cores of group C.
  • the bases 11 A and 12 A of the cores 11 and 12 abut and make direct contact with an inner periphery of the case 1 .
  • the reinforcing ring 25 is disposed between the cores 11 and 12 in order to support the inner periphery of the retaining plates 18 .
  • the first rotor 2 and the second rotor 3 are driven separately by supplying a composite current from a common inverter to the stator coils 16 A and 16 B.
  • the inward displacement of the cores 11 and 12 is also prevented by the retaining plates 18 .
  • the outward displacement of the cores 11 and 12 is limited by the case 1 .
  • FIG. 8 and FIG. 9 A fourth embodiment of the present invention will now be described referring to FIG. 8 and FIG. 9 .
  • the stator is comprised only by the cores 11 of group A.
  • the first rotor 2 and the second rotor 3 are independently rotated by supplying a composite current to the stator coils 16 wound onto the cores 11 .
  • the principle of this motion is also disclosed in the above mentioned U.S. Pat. No. 6,049,152.
  • the structure of the output shafts 4 and 5 and the first rotor 2 and second rotor 3 is the same as that described with reference to the second embodiment and the third embodiment.
  • the retaining plates 18 are engaged with the bases 11 A of the cores 11 . Both ends of the retaining plates 18 are engaged with the ring 21 and 22 of the end plates 1 A and 1 B as in the same manner as the first embodiment.
  • the bases 11 A of the cores 11 have direct contact with the inner periphery of the case 1 in the same manner as described with respect to the third embodiment.
  • the reinforcing ring 25 is disposed between the first rotor 2 and the second rotor 3 to make contact with the inner periphery of the cores 11 .
  • Retaining plates 18 are formed by a high rigidity material such as stainless steel, while the rings 21 and 22 are formed by a low rigidity material as such aluminum. In such a manner, the fixed rings 21 and 22 which are press fitted on an inner side of the retaining plates 18 are deformed by compression and a force is applied in an outer radial direction of the retaining plates 18 .
  • each of the embodiments above has been described as applied to an electric motor.
  • this invention may be applied to a generator provided with separated cores.
  • one retaining plate supports the bases of adjacent cores.
  • two retaining plates may be provided between the adjacent cores such that each retaining plate supports only one of the bases of the cores.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Frames (AREA)
  • Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
US09/670,617 1999-09-27 2000-09-27 Motor/generator with separated cores Expired - Fee Related US6455976B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP27336499 1999-09-27
JP11-273364 1999-09-27
JP2000-234394 2000-08-02
JP2000234394A JP3454234B2 (ja) 1999-09-27 2000-08-02 分割コアモータ

Publications (1)

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US6455976B1 true US6455976B1 (en) 2002-09-24

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Country Status (4)

Country Link
US (1) US6455976B1 (fr)
EP (1) EP1087498B1 (fr)
JP (1) JP3454234B2 (fr)
DE (1) DE60017037T2 (fr)

Cited By (38)

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US20030184245A1 (en) * 2002-04-01 2003-10-02 Nissan Motor Co., Ltd. Drive of rotary electric machine
US20040007938A1 (en) * 2002-05-09 2004-01-15 Shimano, Inc. Claw-pole dynamo with radially offset yoke arms
US6713934B2 (en) * 2000-11-07 2004-03-30 Yamaha Marine Kabushiki Kaisha Generator for an outboard motor
US20040113510A1 (en) * 2002-12-16 2004-06-17 Ulrich Peter Electrical machine
US20040127056A1 (en) * 2002-12-13 2004-07-01 Kim Jong Hoon Method for forming a micro pattern
WO2004107542A1 (fr) * 2003-05-27 2004-12-09 Jae-Shin Yun Generateur utilisant un vecteur magnetique
US20050274771A1 (en) * 2004-06-10 2005-12-15 Kabushiki Kaisha Shinkawa Bonding apparatus
US20070057514A1 (en) * 2005-09-12 2007-03-15 Denso Corporation Vehicle-use generator
US20070063606A1 (en) * 2005-09-16 2007-03-22 Jae-Shin Yun Dual machine, and method of power generation and electromotive operation using the same
US7808149B2 (en) 2004-09-20 2010-10-05 Wilic S.Ar.L. Generator/electric motor, in particular for wind power plants, cable controlled plants or for hydraulic plants
US7893555B2 (en) 2001-09-13 2011-02-22 Wilic S.Ar.L. Wind power current generator
US7936102B2 (en) 2005-11-29 2011-05-03 Wilic S.Ar.L Magnet holder for permanent magnet rotors of rotating machines
US20110109191A1 (en) * 2008-03-22 2011-05-12 Claudinei Altea Generator stator unit
US7946591B2 (en) 2005-09-21 2011-05-24 Wilic S.Ar.L. Combined labyrinth seal and screw-type gasket bearing sealing arrangement
US8120198B2 (en) 2008-07-23 2012-02-21 Wilic S.Ar.L. Wind power turbine
US8274170B2 (en) 2009-04-09 2012-09-25 Willic S.A.R.L. Wind power turbine including a cable bundle guide device
US8272822B2 (en) 2009-01-30 2012-09-25 Wilic S.Ar.L. Wind power turbine blade packing and packing method
US8310122B2 (en) 2005-11-29 2012-11-13 Wilic S.A.R.L. Core plate stack assembly for permanent magnet rotor or rotating machines
US8319362B2 (en) 2008-11-12 2012-11-27 Wilic S.Ar.L. Wind power turbine with a cooling system
US8358189B2 (en) 2009-08-07 2013-01-22 Willic S.Ar.L. Method and apparatus for activating an electric machine, and electric machine
US8410623B2 (en) 2009-06-10 2013-04-02 Wilic S. AR. L. Wind power electricity generating system and relative control method
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US20130154406A1 (en) * 2011-12-19 2013-06-20 Samsung Electro-Mechanics Co., Ltd. Switched reluctance motor assembly
US8492919B2 (en) 2008-06-19 2013-07-23 Wilic S.Ar.L. Wind power generator equipped with a cooling system
US8541902B2 (en) 2010-02-04 2013-09-24 Wilic S.Ar.L. Wind power turbine electric generator cooling system and method and wind power turbine comprising such a cooling system
US8618689B2 (en) 2009-11-23 2013-12-31 Wilic S.Ar.L. Wind power turbine for generating electric energy
US8659867B2 (en) 2009-04-29 2014-02-25 Wilic S.A.R.L. Wind power system for generating electric energy
US8669685B2 (en) 2008-11-13 2014-03-11 Wilic S.Ar.L. Wind power turbine for producing electric energy
US8937397B2 (en) 2010-03-30 2015-01-20 Wilic S.A.R.L. Wind power turbine and method of removing a bearing from a wind power turbine
US8937398B2 (en) 2011-03-10 2015-01-20 Wilic S.Ar.L. Wind turbine rotary electric machine
US8957555B2 (en) 2011-03-10 2015-02-17 Wilic S.Ar.L. Wind turbine rotary electric machine
US8975770B2 (en) 2010-04-22 2015-03-10 Wilic S.Ar.L. Wind power turbine electric generator and wind power turbine equipped with an electric generator
US9006918B2 (en) 2011-03-10 2015-04-14 Wilic S.A.R.L. Wind turbine
US20160372993A1 (en) * 2013-07-31 2016-12-22 Aisin Aw Co., Ltd. Coil installation method and coil installation jig
WO2017139101A1 (fr) * 2016-02-10 2017-08-17 Moog Inc. Stratification de moteur atténuant le glissement constant du couple
US9985512B2 (en) 2010-05-17 2018-05-29 Magnomatics Limited Large magnetically geared machines
EP3396824A4 (fr) * 2016-02-04 2018-10-31 Jing-Jin Electric Technologies Co., Ltd Moteur intégré
US20190084402A1 (en) * 2017-09-21 2019-03-21 Schaeffler Technologies AG & Co. KG Hybrid motor vehicle drive train including hybrid module baffle blade

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EP1164688B1 (fr) 2000-06-14 2007-07-18 Nissan Motor Company, Limited Machine rotative électrique avec une structure de support pour un stator
JP4069796B2 (ja) * 2003-05-08 2008-04-02 日産自動車株式会社 複軸多層モータの磁気回路制御装置
WO2005011092A1 (fr) * 2003-07-25 2005-02-03 Mitsuba Corporation Moyeu dynamometrique
JP5326432B2 (ja) * 2008-08-28 2013-10-30 アイシン精機株式会社 回転電機のステータ固定構造

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JP3454234B2 (ja) 2003-10-06
EP1087498A2 (fr) 2001-03-28
EP1087498A3 (fr) 2003-09-03
EP1087498B1 (fr) 2004-12-29
DE60017037T2 (de) 2005-12-08
JP2001169483A (ja) 2001-06-22

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